Question

A yellow laser of wavelength 610nm is passed through a diffraction grating with 4.33×10^5 lines per metre. Determine the maximum number of orders possible.

Answer 1

$$N=\frac{d}{\lambda}$$

$$N=\frac{1}{(610\cdot10^{-9})(4.33\cdot10^{5})}=3.8$$

Thus, the maximum number of orders possible is 3.